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Psoralen, also known as psoralen lactone and spot-making hormone, is an effective component extracted from plant psoralen, belonging to furanocoumarins. It has the effect of promoting the increase of melanin in the skin. It is clinically used in the treatment of vitiligo, alopecia areata and psoriasis. Psoralen has the effect of increasing melanin. Uv irradiation can produce phototoxic reaction and selectively inhibit DNA synthesis in epidermal cells.